Reinforcing ply for objects made of elastomer material, preferably for pneumatic vehicle tires and pneumatic vehicle tires as same
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Solution Overview
Problem
Existing reinforcement layers for elastomeric materials, particularly in vehicle tires, face challenges in maintaining high modulus and resistance to fatigue under pressure and bending stress, especially at high speeds, leading to increased rolling resistance and reduced performance.
Innovation Solution
The use of polyamide 6.6 multifilament yarns with specific tenacity and heat shrinkage properties, achieved through controlled hot-stretching and impregnation, results in a reinforcement layer with enhanced modulus and fatigue resistance, suitable for high-speed tire applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional polyamide reinforcements are used in the belt bandage, then the tire structure provides basic reinforcement, but the tire exhibits increased rolling resistance and reduced high-speed performance
Solution Approach 1:
The patent applies parameter changes by precisely controlling the heat shrinkage temperature (140°C to 170°C) and duration (0.5 to 2 minutes) of the polyamide 6.6 multifilament yarns. This thermal treatment modifies the crystalline structure and molecular orientation of the polyamide, resulting in optimized elastic modulus and tensile strength characteristics that reduce energy loss during tire operation at high speeds
Solution Approach 2:
The invention uses composite material principles by combining polyamide 6.6 multifilament yarns with rubber mixture to create a rubberized reinforcement layer. The specific composition ratio and integration method create a composite structure that optimizes both mechanical reinforcement and energy efficiency, reducing rolling resistance while maintaining high-speed performance
2Ease of manufacture
If the reinforcement layer is designed to allow tire elevation during vulcanization, then the tire can be properly formed, but the reinforcement may relax and lose modulus
Solution Approach 1:
The patent applies preliminary action by pre-treating the polyamide 6.6 multifilament yarns with controlled heat shrinkage before they are incorporated into the tire structure. This preliminary thermal treatment pre-sets the dimensional stability and elastic properties of the reinforcement, enabling the tire to undergo vulcanization elevation without causing the reinforcement to relax and lose modulus
Solution Approach 2:
The invention uses parameter changes by optimizing the heat shrinkage temperature range (140°C to 170°C) and time duration (0.5 to 2 minutes) to achieve the desired balance between manufacturability and strength retention. These controlled parameter changes create a reinforcement structure that maintains its mechanical properties throughout the tire manufacturing process
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The reinforcement layer maintains required elongation for tire production while requiring higher forces at higher elongations, improving high-speed performance and reducing rolling resistance, with retained properties preventing relaxation and modulus loss.
Implementation Method 1
the raw yarn made of polyamide 6.6 has a tenacity related to a tenacity which, with an elongation of 4%, is in a range from 1.35 cN/dtex to 1.60 cN/dtex and that the twisted, dipped and hot-stretched multifilament yarn has a tenacity related to an elongation of 4% in a range from 2.0 cN/dtex to 2.8 cN/dtex
Implementation Method 2
the reinforcement has a heat shrinkage at 177°C in a range from 4.0% - 7.0%, with the tenacity based on ASTM D885-16 and the heat shrinkage being determined at 177° C. under a prestress of 0.045 g/dtex with an exposure time of two minutes
Implementation Method 3
each reinforcement made of polyamide 6.6 and having the construction x1, i.e. a twisted multifilament yarn made of polyamide 6.6 is
Implementation Method 4
the reinforcement layer maintains required elongation for tire production while requiring higher forces at higher elongations
Data Source
AI summary
Rubberized reinforcement layer for objects made of elastomeric material, preferably for vehicle tires, the reinforcement layer having a multiplicity of parallel and spaced-apart reinforcement members, each reinforcement member consisting of polyamide 6.6 and having the construction x1, i.e. a twisted multifilament yarn made of polyamide 6.6. The raw yarn made of polyamide 6.6 has a tenacity related to an elongation of 4% in a range from 1.35 cN/dtex to 1.60 cN/dtex, the multifilament yarn has a tenacity related to an elongation of 4 % is in a range of 2.0 cN/dtex to 2.8 cN/dtex and the cord has a heat shrinkage at 177° in a range of 4.0% - 7.0%, the tenacity being according to ASTM D885 -16 and the heat shrinkage at 177°C under a preload of 0.045 g/dtex with an exposure time of two minutes are determined.